ResourceT

ResourceT can be used as a monad transformer for scalaz.Name

import scalaz.Name
import com.thoughtworks.raii.covariant._
type RAII[A] = ResourceT[Name, A]

Given a resource that creates temporary files

import java.io.File
val resource: RAII[File] = ResourceT(Name(new Resource[Name, File] {
  override val value: File = File.createTempFile("test", ".tmp");
  override val release: Name[Unit] = Name {
    val isDeleted = value.delete()
  }
}))

when using temporary file created by resouce in a for / yield block, those temporary files should be available.

import scalaz.syntax.all._
val usingResouce = for {
  tmpFile1 <- resource
  tmpFile2 <- resource
} yield {
  tmpFile1 shouldNot be(tmpFile2)
  tmpFile1 should exist
  tmpFile2 should exist
  (tmpFile1, tmpFile2)
}

and those files should have been deleted after the for / yield block.

val (tmpFile1, tmpFile2) = usingResouce.run.value
tmpFile1 shouldNot exist
tmpFile2 shouldNot exist